Create problem2.cpp

Author: JimTsai2

homework1/src/problem2.cpp

@@ -0,0 +1,23 @@
+#include <iostream>
+#include <cmath>
+using namespace std;
+
+int main() {
+    char S[] = { 'a', 'b', 'c' };
+    int n = 3;
+    int total = pow(2, n);
+
+    for (int i = 0; i < total; ++i) {
+        cout << "{";
+        bool first = true;
+        for (int j = 0; j < n; ++j) {
+            if (i & (1 << j)) {
+                if (!first) cout << ", ";
+                cout << S[j];
+                first = false;
+            }
+        }
+        cout << "}" << endl;
+    }
+    return 0;
+}